Is the MIDI editor free?
Yes. Moving notes in this tab does not spend credits.
Piano roll
Load a .mid, move notes on the grid, export when it sounds right. The draft lives in this tab.

Get a .mid in, put notes where they belong, take a .mid out.
Open a file from disk, or arrive here from an Audio to MIDI conversion.
Drag, resize, change velocity, set BPM. Listen after each move.
The tab can remember the session. Download when the file has to travel.
You are editing instructions: pitch, when it starts, how long, how hard, how fast, which sound. The original recording is untouched.
Delete extras, drop octaves that jumped, and snap the phrase to the click.
Swap the patch and the tempo. The hummed line still exists as audio on your machine; this file is only the notes.
Yes. Moving notes in this tab does not spend credits.
No. It writes to localStorage in this browser. We never get the file.
Yes. Convert first, then send the result here and clean the grid.
Editing still works. Download the .mid before you close the tab.